9781423901402_PPT_Ch11 - Information Technology in Theory...

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Chapter 11 Local Area Networks Information Technology in Theory By Pelin Aksoy and Laura DeNardis
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2 Objectives Gain familiarity with the most popular types of local area networks (LANs), with a focus on Ethernet Understand LAN design characteristics, including topology, access mechanism, physical transmission media, and equipment Information Technology in Theory
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3 Objectives (continued) Explain what a frame format is and what purpose it serves in LANs Define the functions of LAN operating systems Understand the technical architecture of Wi-Fi Information Technology in Theory
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4 Network Categories Local area networks (LANs) Wide area networks (WANs) Personal area networks (PANs) Metropolitan area networks (MANs) Campus area networks (CANs) Storage area networks (SANs) Information Technology in Theory
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5 Defining LANs LAN —a network that spans a confined geographical distance, such as a building or home WAN —a network that spans a larger geographical area, such as a city, nation, or the world at large Information Technology in Theory
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6 Resources Accessed via LANs Information Technology in Theory
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7 LAN Design Characteristics Physical topology Logical topology Access control and LAN switching LAN physical media and equipment LAN operating systems Information Technology in Theory
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8 Physical Topology A LAN’s physical topology refers to how the multiple devices (often called network nodes ) are physically connected to each other Star Ring Star-Wired Ring Bus Information Technology in Theory
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9 Star Topology Information Technology in Theory
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10 Ring Topology Information Technology in Theory
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11 Star-Wired Ring Topology Information Technology in Theory
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12 Bus Topology Information Technology in Theory
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13 Logical Topology While the physical topology describes how network nodes are connected within the LAN, the logical topology dictates how information flows among the nodes Common logical topologies for LANs Bus Ring Star Information Technology in Theory
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14 Access Control and LAN Switching Access control mechanism A procedure that specifies and enforces rules for when each device may transmit or receive information over a network Token passing CSMA/CD CSMA/CA Information Technology in Theory
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15 Token Passing Uses a deterministic access method Each node communicates only during its specified turn A token , which is just a signal that comprises a specific bit pattern, is transmitted from one device
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9781423901402_PPT_Ch11 - Information Technology in Theory...

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